By Theresa Harrington/ Contra Costa Times

An educational advocacy group released its third annual District Report Cards earlier this week, showing that half of the largest Bay Area unified districts improved in their efforts to educate low-income students and those who are black or Latino.

But still far too many districts are failing — or getting average and below-average marks, including Vacaville Unified School District and two other Solano County districts — to adequately prepare those students for graduation and for college, according to the Oakland-based Education Trust-West.

via Bay Area school districts, including Vacaville Unified, failing ….